Equivalent & Substitute Parts for Bourns 9250-333

Part Overview

The Bourns 9250-333 is a 33 µH shielded drum core wirewound inductor rated for 240 mA with a maximum DC resistance of 1.37 Ohm. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates across a temperature range of -55°C to 105°C and is designed for through-hole axial mounting in electronic circuits requiring fixed inductance values with ferrite core construction.

Key Parameters

Parameter	Value
Inductance	33 µH
Tolerance	±10%
Current Rating	240 mA
Current - Saturation (Isat)	190 mA
DC Resistance (DCR)	1.37 Ohm Max
Q @ Frequency	45 @ 2.5 MHz
Frequency - Self Resonant	34 MHz
Operating Temperature	-55°C ~ 105°C
Shielding	Shielded
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.162" Dia x 0.410" L (4.11 mm x 10.41 mm)

Substitute Part Grouping Explanation

Substitution for the Bourns 9250-333 is determined by strict equivalence across the following critical parameters: inductance value (33 µH), tolerance (±10%), current rating (240 mA), DC resistance (1.37 Ohm Max), Q factor (45 @ 2.5 MHz), self-resonant frequency (34 MHz), mounting type (through hole), package type (axial), and physical dimensions (0.162" Dia x 0.410" L).

The substitute parts are grouped into two categories:

Direct Manufacturer Substitute: The Bourns 9250A-333-RC maintains identical electrical specifications and physical dimensions while offering improved product status (active vs. obsolete) and enhanced RoHS3 compliance. The primary difference is construction type (molded vs. drum core) and extended operating temperature range (-55°C to 125°C vs. -55°C to 105°C).

Cross-Manufacturer Substitutes: The API Delevan ER1641 series (ER1641-333KM, ER1641-333KP, ER1641-333KR) provides electrical and dimensional equivalence with variations in shielding configuration and packaging format. ER1641-333KR is unshielded, while ER1641-333KM and ER1641-333KP are shielded variants. All three are supplied in tape and reel packaging and comply with military specification MIL-PRF-39010/03.

Parameter Comparison

Parameter	9250-333 (Main)	9250A-333-RC	ER1641-333KM	ER1641-333KP	ER1641-333KR
Manufacturer	Bourns Inc.	Bourns Inc.	API Delevan Inc.	API Delevan Inc.	API Delevan Inc.
Inductance	33 µH	33 µH	33 µH	33 µH	33 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	240 mA	240 mA	240 mA	240 mA	240 mA
DC Resistance (DCR)	1.37 Ohm Max	1.37 Ohm Max	1.37 Ohm Max	1.37 Ohm Max	1.37 Ohm Max
Q @ Frequency	45 @ 2.5 MHz	45 @ 2.5 MHz	45 @ 2.5 MHz	45 @ 2.5 MHz	45 @ 2.5 MHz
Frequency - Self Resonant	34 MHz	34 MHz	34 MHz	34 MHz	34 MHz
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Shielding	Shielded	Shielded	Shielded	Shielded	Unshielded
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial	Axial	Axial
Size / Dimension	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L	0.162" Dia x 0.410" L
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
Packaging Format	Bulk	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

For RoHS3 Compliant Applications: The Bourns 9250A-333-RC is the primary substitute, offering active product status and full ROHS3 compliance. This part maintains electrical equivalence while providing an extended operating temperature range to 125°C, suitable for applications requiring higher thermal margins.

For Military or Specification-Driven Applications: The API Delevan ER1641 series provides MIL-PRF-39010/03 compliance. Selection between ER1641-333KM, ER1641-333KP, and ER1641-333KR depends on shielding requirements. The shielded variants (ER1641-333KM and ER1641-333KP) maintain electromagnetic isolation equivalent to the original 9250-333. The unshielded variant (ER1641-333KR) is suitable only for applications where shielding is not a functional requirement.

For Legacy or Non-Compliant Applications: When RoHS compliance is not required, all substitute parts provide electrical and mechanical equivalence. The choice between Bourns and API Delevan variants depends on supply chain availability and packaging requirements (bulk vs. tape and reel).

Frequently Asked Questions (FAQ)

Q: Can the Bourns 9250A-333-RC directly replace the obsolete 9250-333 in all applications?

A: Yes, the 9250A-333-RC provides complete electrical and mechanical equivalence. The primary differences are construction type (molded vs. drum core) and extended operating temperature range (-55°C to 125°C). Applications operating within the original temperature range (-55°C to 105°C) experience no functional difference.

Q: What is the difference between shielded and unshielded variants in the ER1641 series?

A: The ER1641-333KM and ER1641-333KP are shielded inductors providing electromagnetic isolation, equivalent to the original 9250-333. The ER1641-333KR is unshielded and suitable only for applications where electromagnetic shielding is not required. Shielding affects EMI performance but not the core inductance, tolerance, or current rating specifications.

Q: Are tape and reel packaged parts (ER1641 series) compatible with through-hole assembly processes designed for bulk packaged components?

A: Tape and reel packaging is a supply format difference only. The physical component dimensions and through-hole mounting characteristics are identical to bulk packaged parts. Tape and reel format is standard for automated assembly processes and does not affect circuit-level compatibility.

Q: Does the molded construction of the 9250A-333-RC affect performance compared to the drum core 9250-333?

A: No. Both constructions deliver identical electrical specifications: 33 µH inductance, ±10% tolerance, 240 mA current rating, 1.37 Ohm maximum DC resistance, and 45 Q factor at 2.5 MHz. Construction type is a manufacturing method difference without impact on electrical performance within specified parameters.

Q: Which substitute is recommended for new designs?

A: The Bourns 9250A-333-RC is recommended for new designs requiring RoHS3 compliance and active product status. For military applications, the API Delevan ER1641 series with MIL-PRF-39010/03 compliance is appropriate. Both options provide long-term supply availability and equivalent electrical performance.

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